Create Pages for nx-cugraph

[nv-rliu]

Closes https://github.com/rapidsai/graph_dl/issues/606 and [another issue]

Proposed Changes

In preparation for GA release, this PR adds a landing page for nx-cugraph in the cugraph API documentation site. The new pages can be viewed by clicking nx-cugraph in the navigation bar at the top of the page.

New pages

nx-cugraph
└─ How it works
└─ Supported Algorithms
└─ Getting Started
└─ Benchmarks
└─ FAQ

Notes for Reviewers

• In order to build and test these docs, I modified the build.sh file to use sphinx-autobuild.

122
123     cd ${REPODIR}/docs/cugraph-docs
124     #make html
125     sphinx-autobuild source build/html
126 fi
127

• For now, I believe the best way to view these changes is to clone the PR branch, then run build.sh in order to host the webserver locally..

[acostadon]

Reviewed the pages directly. They look good.

[rlratzel]

Looks like this is targeting branch-24.08 - I'm assuming it should be branch-24.10?